After you file

Today I just received my first IRS notice regarding the CARES Act and amount due for unpaid SS tax. Likewise, I never saw the question about tax deferral as I did not do the tax interview process as just transferred my 2019 tax info into the 2020 tax forms and made changes. I just went back and looked at that interview process and the tax deferral question. TurboTax says "Since you're getting a refund this year, it looks like you're not eligible to defer the SS portion of your self-employment tax". Then why did I receive a notice from the IRS that I owe that tax. Did the IRS assume that all TT prepared returns opted for the tax deferral? Now I must contact the IRS (and spend a lot of valuable time) and convince them the tax is not due.......frustrating to say the least.